Nouns of Position - 上、下、里、外…
The nouns of position 上, 下, 里, 外, 前, and 后 come after a noun to indicate a location.
上下里外前后
Noun + 上 / 下 / 里 / 外 / 前 / 后
书在桌子上。
The book is on the table.
桌子下面有一只猫。
A cat is under the table.
Front / Back
Front and back markers for relative position and orientation.